运用勾股定理及其逆定理可以解决生活中的许多问题,如圆柱的侧面展开图问题、航海问题、梯子问题、折叠问题、判断垂直的问题,等等,解决问题的关键是根据题意画出正确的图形.在解决实际问题的过程中,主要体现了数形结合的思想.一、旗杆问题例1小明想知道学校旗杆的高,他发现旗杆顶端的绳子垂到地面还多1米,当他把绳子的下端拉开5米后,发现下端刚好 The use of the Pythagorean Theorem and its inverse theorem can solve many problems in life, such as the cylinder side of the development plan, navigation problems, ladder problems, folding problems, to determine the vertical problems, and so on, the key to solving the problem is based on the topic Out of the correct graphics. In the process of solving practical problems, mainly reflects the idea of ​​a combination of several figures .One, the flagpole problem Example 1 Xiao Ming want to know the school flagpole high, he found the top of the flagpole rope down to the ground more than 1 meter, When he pulled the lower end of the rope 5 meters and found the bottom just right